I have a DCR010505 running from a bench top psu 5V output, I am using it to generate a -5V supply:
The load on the 5VANA and -5VANA are 6 op-amps each with 100nF decoupling on both +ve and -ve supplies. Total current consumtion is 13mA.
Occasionally, particularly when cold, the DCR010505 does not start up:
Yellow: 5V Bench Top PSU switching on,
Green is the -5VANA supply output.
The normal start up is this:
Does anyone have any ideas as to why it occasionaly fails to start?
Many Thanks.
Gordon
Hi Tom,
Unfortunately I have seen another fail on the start-up of the DCR010505. It does not look like the 200K pull-up is solving the issue.
I managed to trigger the scope on both power up :
And also when the -5V kicked into life:
This happened about 30seconds after the power up.
As you can see on power up the -5V bus rises to about +800mV , I don’t know when it started to oscillate as I haven’t managed to capture it.
This occurs on 2 boards with the same circuit. 1 board is more likely to fail to start than the other. Both have the 200K pull-up. And it seems to happen if the boards have been switched off for a long time (1hour).
Any ideas?
Many thanks
Gordon
